Anybody would know to create a Plug-In for Virtuemart?

Anybody would know to create a Plug-In for Virtuemart 1 or 2?
I would be willing to pay for the development, and I'm sure many other people too ...
I hope that after all the times we have asked to the Artisteer team for create a SDK, now it appears that no one wants to use it for develop ... I hope developers interested